Method for producing Phillips catalysts for polymerizing olefins with better productivity rates in the particle-form process

US6699947B1 · kind B1 · utility

Assignee

• Basell Polyolefine GmbH · DE

Inventors

• Kaspar Evertz · Schifferstadt, DE
• Guido Funk · Worms, DE
• Paulus De Lange · Wesseling, DE
• Peter Kölle · Bad Dürkheim, DE
• Andreas Deckers · Flomborn, DE

Key dates

• Filing date: Mar 11, 2002
• Grant date: Mar 2, 2004
• Expiry date: Mar 11, 2022

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F110/02
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

In a process for producing Phillips catalysts in which an oxidic support material is treated in suspension with a chromium salt solution and subsequently, after removing the solvent, calcined in an oxygen-containing atmosphere at above 300&deg; C., the oxidic support material and/or the catalyst after calcination are/is, according to the present invention, comminuted until a mean particle size of <100 &mgr;m has been reached and the proportion of particles having a size of <50 &mgr;m is at least 30%, preferably in the range from 40 to 80%. A process for preparing homopolymers or copolymers of ethene in a loop reactor at from 30 to 150&deg; C. under a pressure in the range from 0.2 to 15 MPa in the presence of a catalyst produced by the process of the present invention is also provided.